Cummins/Onan — Main Winding Inspection
Testing & diagnosis · Alternator main winding
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Set voltage selector switch to 120 V only position.
- Using ohmmeter, measure resistance between AC output terminals.
- If resistance is zero or infinity, replace stator.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 2400: 0.51-0.53 Ω
- 3500 main winding I: 0.76-0.79 Ω
- 3500 main winding II: 0.76-0.79 Ω
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.